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Consolidated Statements of Equity (Parentheticals) - $ / shares | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
$4.50 Series Preferred Stock [Member] |  |
Preferred Stock, Dividends Per Share, Declared | $ 1.125 | $ 1.125
$3.50 Series Preferred Stock [Member] |  |
Preferred Stock, Dividends Per Share, Declared | $ 0.875 | $ 0.875

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- Details
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